Apparent and partial molar heat capacities and volumes of aqueous adipic acid, l-tartaric acid, and their sodium salts atT = 298.15 K

Abstract

Apparent molar heat capacities and volumes have been determined at T= 298.15 K for aqueous solutions of adipic acid (H2A, A = C6H8O4), sodium hydrogen adipate (NaHA), and a buffer solution of NaHA andNa2A; and for aqueous solutions ofl-tartaric acid (H2T, T = C4H4O6), a buffer solution of H2T and NaHT, a buffer solution of NaHT and Na2T, and a solution of sodiuml-tartrate(Na2T) . The experimental results have been analysed by using a simple extended Debye–Hückel equation, to derive the partial molar properties of aqueous adipic acid,l-tartaric acid and their corresponding sodium salts at infinite dilution, and the standard partial molar volume and heat capacity changes for the ionization of adipic acid andl-tartaric acid.